<http://schema.org/mainEntityOfPage>
<http://www.upi.com/Science_News/2012/07/17/Pilfering-rodents-help-trees-survive/99721342564092/>
<http://www.upi.com/Science_News/2012/07/17/Pilfering-rodents-help-trees-survive/UPI-99721342564092/>